Constant speed web windup



y 1959 R. LE B. BOWEN, JR

CONSTANT SPEED WEB WINDUP Filed Feb. 12. 1954 FIG. I

nll llr.

IN V EN TOR.

ATTOR N EY 2,ss7,2so CONSTANT srnnn WEB WINDUP, Richard Le B. Bowen,J13, Pawtucket, RJ. j Application February 12, 1954, Serial No. 409,933

*Claims. Cruz- 45.5

This invention relatesto a mechanism for winding web material intorolls, and more particularly to a mech anismwhich will wind thel webmaterial at a-constant linear speed. t 1

An object of the present invention is to provide a mechanism which willwind a roll of web material at a constant linear speed. 1 1

Another object of the present invention is to provide a mechanism whichwill wind a roll of web material from a starting position to a very highconstantlineartspeed, quickly and automatically. 1 t 1 Other objects ofthe present invention will be pointed out in part and will becomeapparent in part, in the following specification and claims. w: .In thepast mechanisms which rewound web material from one roll to another forthe purpose of straightening the roll, changing the density of thepackage, inspectingthematerial, fixed the winding roll to ashaft whichwas driven at a constant speed. As thewinding roll in creased indiameter due to the accumulating web, the peripheral speed increased inproportion to the increasing diameter. This speed increase was reflectedin the linear speedof the web passing from one. roll to another. Toprevent too great an increase in speed, it was common practice to runthe first part of the roll slower than was necessary. 1 l t 1 t Thepresent inventionobviates this undesirable condition by fixing the rollto be driven to ashaft which automatically slows down as the rollincreasesin diameter, without resorting to devices which press againstthe webmaterial on the roll being wound. Said devices undesirably tendto mar the web material.

In the accompanying drawing wherein like. reference characters refer tolike parts t Figure l is a'diagrammatic plan view, partly insection,showing the newand improved constant speed web.wind- I .Figure 2 is aside elevational view of a detailed part of the mechanismtaken on line 2-2 of Figure. 1. t According to the invention in its general aspects,the winding roll is driven from a constant speed power source throughavariable speed mechanism. Anwidler roller, driven by the web materialserves a's a. speed detecting device, driving oneelementof adifferential gear train, another element of which is driven at aconstant speed, Errors in the speed of the web are corrected by thethird element of the differential gear {train which changes the speed ofthe variable speed mechanism.

Referring to the drawing, web 11 is being unwound from storage roll 12and wound into finished roll 13. In passing from storage roll 12 tofinish roll 13, web 11 passes first under idler roller 14, then overspeed detecting roller 15, then under a second idler roller 16. Rollers14, 15, 16 can be located on any type of machine wherein web material isprocessed, the web passing from a storage roll to the processingmechanism and then to the take-up or finished roll.

A differential gear train 52 is provided, consisting of U te Sta e Pat b2,887,280 in 1 Patented M y-19,1959

2 a casing 46, which provides journals for an input shaft 22, an outputshaft 23 and an idler shaft 51. Bevel gears 56 and 57 provided withextended hubs are rotatively mounted for independent rotation on idlershaft 51. Bevel gears 54 and 55 which are in engagement with bevel gears56 and 57, are journalled to a carrier 19 through stub axles 53, 53A.Carrier 19 isfixed to idler shaft 51. Input shaft 22 is connected to theshaft 20 of an electric motor 17 through a coupling 21. A sprocket 62fixed to input shaft22 is operatively connectedthrougha chain 61 to asprocket fixed to the extended hub of bevel gear 56. 1 t i A speeddetecting shaft 65 journalled in casing 46 has a spur gear 64 fixed to"it; A spur gear 63' fixed to the extended hub-of bevelgear 57 mesheswith spur gear 64. A shaft extension 67 connected by means of cou-"pling 66 to speed detecting shaft 65 has a bevelpinion gear 68 inengagement with a bevel gear 70secured to the shaft to which speeddetecting roller 15 is fixed. A hydraulic pump 73 may be secured tocasing 46 with the spindle 72 of said pump journalled in said casing. Aspur gear 71 fixed to spindle 72 meshes with spur gear 64. Casing 46acts as a reservoir for the stor age of hydraulic fluid. A suction line74 connects hydraulic pump 73 with the reservoir. A discharge line 75providedwith a throttle valve 76 and a fluid pressure gage 77 connectshydraulic pump 73 with the reservoir. Output shaft 23 is connected tooutput shaft extension 28 by means of coupling 27. A bevel pinion gear30 secured to the end of output shaft extension 28 engages bevel gear 31secured to shaft 32, which has finish roll 13 secured to it. l Anauxiliary spindle 80 journalled in casing 46 is provided with a handwheel tiland a spur gear 82, both of which are fixed to it. 1 A spurgear 83 fixed to out put shaft 23 meshes with spur gear 82. l Anexpansible I-pulley generally indicated by reference character 26,consists of a coned disk 40 having an elongated hub 41 fixed to outputshaft 23. A mating coned disk 42 is slidably mounted on elongated hub'412 A ballthrust bearing 43 which is secured to the hub of coned"disk4 2abuts disk .42 and thrust ring 44whicli has two projecing arms 44A and44B. "See Figure 2. Thru'st'ring44 is pivotally' mounted on lever 45*which in turnis pivotally mounted to bracket 47.. wwBracketw47: is fixedto casing 46. A yoke 48 formed in'oneend of lever 45 has a threadedblock 50 pivotally mounted in said yoke. Idler shaft 51 is, providedwith threadson one end which engage the threadsin block 50. Aresiliently expansible V-pulley generally indicated by referencecharacter 24 consists of a coned disk 33 having an elongated hub 34fixed toinput shaft -22. A mating coned disk35 is slida bly mounted onelongated hub 34. A stopwashef 36 secured to the end of elon gated hub34 provides an abutment for one end of a coil spring 37 whichencompasses the hub of coned 35. The'oposite end of coil spring 37 abutscone sk 35, tending to constantly forceiconed disks 33,135 .to g t m lla Resiliently expansible V-pul1ey 24 1 connected: to pansible Vpull'ey26 bymeans aseagaaiva 'vaat 5S1 In operation, electric motor 17 drivesinput shaft 22, resiliently expansible V-pulley 24 and through edgeactive V-belt 25, expansible V-pulley 26; which in turn drives outputshaft 23, output shaft extension 28, bevel pinion 30, bevel gear 31,shaft 32 and finish roll 13.

Motor 17 driving input shaft 22 also drives sprocket 62, chain 61,sprocket 60 and bevel gear 56.

Web 11 being drawn oif storage roll 12 by the action of finish roll 13passes under idler roller 14, speed detecting roller 15 and idler roller16, driving them. Speed.

detecting roller through its shaft and bevel gear 70, 2

drives bevel pinion 68, shaft extension 67, speed detecting shaft 65,spur gear 64, spur gear 63 and bevel gear 57.

Bevel gear 70, bevel pinion 68, spur gears 63 and 64 are so designed,that when web 11 is traveling at the desired speed, bevel gear 56 andbevel gear 57 are traveling at the same speed in relation to each other.When bevel gears 56 and 57 travel at the same speed, idler shaft 51 ismotionless.

Assume that finish roll 13 is revolving at an arbitrary speed. Asadditional web material winds onfinish roll 13 it increases in diameterand its peripheral speed increases, increasing the speed in which web 11is drawn ofi storage roll 12. Thus the speed of speed detecting roller15 increases and through speed detecting shaft 65, spur gears 64, 63,bevel gear 57 changes its speed relative to bevel gear 56 causing idlershaft 51 to rotate through bevel gears 54 and 55. Rotation of idlershaft 51 moves threaded block 50 away from casing 46, thus forcing coneddisk 42 closer to coned disk 40, increasing the pitch diameter ofexpansible V-pulley 26 and simultaneously decreasing the pitch diameterof resiliently expansible V-pulley 24 as edge active V-belt 25 forcesconed disk 35 away from coned disk 33.

In actual operation, the movement of idler shaft 51 is hardlyperceptible. Therefore the reduction in speed of output shaft 23 issteplessly accomplished.

When the web material 11 on storage roll 12 becomes exhausted, themechanism has shifted so that output shaft 23 is travelling at itsminimum speed. Replenishment of storage roll 12 and the attachment ofweb 11 to a new core for finish roll 13 finds the initial speed ofoutput shaft 23 at the minimum and not at a maximum. The differentialgear train 52 is unbalanced. Speed detecting roller 15 will detect thisslow speed and accordingly will very rapidly bring the speed of speeddetecting shaft 65 in harmony with input shaft 22. Thus when high webvelocities are used, the mechanism starts slowly but automaticallybrings the speed of output shaft 28 to its maxi- If it is desired tostart a finish roll 13 at maximum speed, handwheel 81 is manuallyrotated, causing spur gear 82 and spur gear 83 to rotate output shaft 23and cone disk 40 to change the pitch diameters of expansible V-pulleys26 and 24, so that the pitch diameter of 24 is greater than 26.

In the description of the mechanism so far, tension is applied to web 11between storage roll 12 and finish roll 13 by the friction of themechanism and the inertia of storage roll 12. If this tension isinsufficient a braking force may be applied to speed detecting roller15, thereby applying tension between storage roll 12 and finish roll 13.Throttle valve 76 is adjusted. Speed detecting shaft 65 through spurgears 64, 71 and spindle. 72 will use part of its speed and energy topump hydraulic fluid through the medium of hydraulic pump 73. A pressuregage 77 may be installed in line 75 so that the amount of tensionapplied to web 11 through speed detecting roller 15 can be observedvisually. The amount of tension is proportional to the pressure set bythrottle valve 76.

Having illustrated and described a preferred embodiment of the presentinvention, by way of example, but realizing that structural changescould be made and other p I '4 f examples given without departing fromeither the spirit or scope of this invention what I claim is:

1. In a constant speed winding mechanism, an input. shaft rotatable at aconstant speed, an output shaft, means connecting said output shaft to aload means, a third shaft providing a variable rotary power source, avariable speed transmission connecting said input and output shafts, andhaving a speed changing mechanism, a differential gear train having afirst rotary member connected to said input shaft, a second rotarymember connected to said third shaft, and a third rotary memberresponsive to variation in the speed between said input shaft and thirdshaft connected to said speed changing mechanism for varying the speedof said output shaft, and means for loading said third shaft to providea predetermined opposing force to the rotation thereof by saiddiiferential.

2. A constant speed winding mechanism according to claim 1 wherein saidmeans loading said third shaft is a pump.

3. A constant speed winding mechanism according to claim 1 wherein saidthird shaft is rotated by a roller engaged by a web traveling to saidload means.

4. A constant speed winding mechanism according to claim 1 wherein saidspeed changing mechanism is threadedly connected to the said thirdrotary member.

5. In a constant speed winding mechanism, a variable speed transmissionhaving an input shaft, an output shaft, and a speed changing mechanism,a take-up beam connected to be driven by said output shaft, a supplyroll from which a web is traveled to said take-up beam, power means forrotating said input shaft at a constant speed, a roller engaged by saidweb during the travel thereof and rotated thereby, means independent ofthe supply roll for applying a predetermined drag on said roller, adifferential train of gears having a first rotatable power transmittingmember, a second rotatable power transmitting member, and a thirdrotatable power transmitting member rotatable in response to variationin the speed of rotation between the said first and second rotatablemembers, means connecting the first said rotatable member to said powermeans for rotation thereby, meanscon necting the said second rotatablemember with said roller for rotation thereby, and means connecting thesaid third rotatable member to said speed changing mechanism fordecreasing the velocity of said output shaft in response to increase inthe velocity of the travel Web.

References Cited in the file of this patent UNITED STATES PATENTS2,168,071 Perry Aug. 1, 1939 2,178,414 Zarafu Oct. 31, 1939 2,392,226Butterworth et al. Jan. 1,1946 2,496,977 Bechle Feb. 7, 1950 2,563,660Rebut et al. Aug. 7, 1951 2,639,868 Trofimov May 26, 1953 2,737,354Trofimov Mar. 6, 1956 OTHER REFERENCES Reeves Automatic ProductionControl, Booklet No. T-361, published by Reeves Pulley Company,Columbus, Indiana. (Page 7 relied on.)

Speed-Gab January-February 1936; published by Reeves Pulley Co.,Columbus, Ind. (Page 6 anddrawing 26856 relied on.)

